Membership files and other contact lists typically contain numerous duplicates and other data issues. Duplicates are often difficult to identify because of typos, nicknames, changed last names, changes of address, etc. WhoopDeDupe will quickly and easily clean up your lists and identify your duplicates with only a few clicks. Even if your lists are non-standard data files such as Word labels, simple typed lists, copied lists or OCR scanned lists, WhoopDeDupe can usually process these files in a flash. WhoopDeDupe can combine many files and file formats together into a single list with only one click every time. If you need to find matching persons in multiple lists, there is no better solution. WhoopDeDupe has been compared to alternative products, and the match rates from WhoopDeDupe are always higher and the results are always more reliable. The Service Employees International Union (SEIU) uses this software to process a high volume of data files daily. In December of 2009 SEIU wrote: "It works ridiculously well."